# particles-param-unknown

> Talos next · Since 0.7

an effect param was not applied: the `particles` component's `params`, a `ctx.particles.play` call or `ctx.particles.setParam` named a param the effect does not declare, or gave a value that does not fit its type (a number param takes a number; a vec3 `[x, y, z]`; a colour `[r, g, b, a]` or `"#rrggbb"`); said once per source and name

| | |
|---|---|
| Severity | `warning` |

## Meaning

an effect param was not applied: the `particles` component's `params`, a `ctx.particles.play` call or `ctx.particles.setParam` named a param the effect does not declare, or gave a value that does not fit its type (a number param takes a number; a vec3 `[x, y, z]`; a colour `[r, g, b, a]` or `"#rrggbb"`); said once per source and name

## Fix

use a name from the effect file's `params` (the message lists them) and a value of its type